[Home](./index.md) > [@firebase/auth](./auth.md) > [signInWithEmailLink](./auth.signinwithemaillink.md)
## signInWithEmailLink() function
Asynchronously signs in using an email and sign-in email link.
Signature:
```typescript
export declare function signInWithEmailLink(auth: Auth, email: string, emailLink?: string): Promise;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| auth | [Auth](./auth.auth.md) | The Auth instance. |
| email | string | The user's email address. |
| emailLink | string | The link sent to the user's email address. |
Returns:
Promise<[UserCredential](./auth.usercredential.md)>
## Remarks
If no link is passed, the link is inferred from the current URL.
Fails with an error if the email address is invalid or OTP in email link expires.
Note: Confirm the link is a sign-in email link before calling this method firebase.auth.Auth.isSignInWithEmailLink.
## Example
```javascript
const actionCodeSettings = {
url: 'https://www.example.com/?email=user@example.com',
iOS: {
bundleId: 'com.example.ios'
},
android: {
packageName: 'com.example.android',
installApp: true,
minimumVersion: '12'
},
handleCodeInApp: true
};
await sendSignInLinkToEmail(auth, 'user@example.com', actionCodeSettings);
// Obtain emailLink from the user.
if(isSignInWithEmailLink(auth, emailLink)) {
await signInWithEmailLink('user@example.com', 'user@example.com', emailLink);
}
```